Here Retinasizer - Upscale your OpenGL games! - Touch Arcade
I hope that explains. Retinasizer upscales openGL rendered games for retina display. If a 3D game still isn't running in retina after you downloaded this app, you can add games under the Library/MobileSubstrate/DynamicLibraries/Retinasizer.plist file. It's simple just do this:

1. Go to a new line BEFORE these tags
</array>
</dict>
</dict>
</plist>

2. Write:<string>com.example.game</game> (fill com.example.game with the app code you want to add)

3. Save and respring!

_______________________________________________It's an iOS world, where I would rather run Android OS...